摘要:
The present invention provides a method of manufacturing a bipolar transistor. The method may comprise forming a collector in a semiconductor wafer substrate, forming a base in the collector, implanting an oxide region within said collector and over the base, and forming an emitter over the substrate such that the oxide region is located between the emitter and the base.
摘要:
A bipolar fabrication process, illustratively suited for integration into a conventional CMOS process to thereby form a BiCMOS integrated circuits is disclosed. The collector and base are formed through multiple implants and a single masking step to thereby provide a continuous low resistance collector region.
摘要:
A process for forming a bipolar junction transistor (BJT) in a semiconductor substrate and a BJT formed according to the process. A buried isolation region is formed underlying BJT structures to isolate the BJT structures from the p-type semi-conductor substrate. To reduce capacitance between a BJT subcollector and the buried isolation region, prior to implanting the subcollector spaced-apart structures are formed on a surface of the substrate. The subcollector is formed by implanting ions through the spaced-apart structures and through a region intermediate the spaced-apart structures. The formed BJT subcollector therefore comprises a body portion and end portions extending therefrom, with the end portions disposed at a shallower depth than the body portion, since the ions implanting the end portions must pass through the spaced-apart structures. The shallower depth of the end portions reduces the capacitance.
摘要:
A resistor formed on a material layer of a semiconductor integrated circuit and a method for forming the resistor. The resistor comprises a region of resistive material with a plurality of conductive contacts or plugs in electrical contact with and extending away from the resistive material. A first and a second interconnect line are formed overlying the plugs and in conductive contact with one or more of the plurality of plugs, such that a portion of the resistive material between the first and the second interconnect lines provides a desired resistance. According to a method of the present invention, the plurality of conductive contacts are formed using a first photolithographic mask and the first and the second interconnect lines are formed using a second photolithographic mask. The desired resistance is changed by modifying the first or the second mask such that one or more dimensions of a region of the resistive material between the first and the second interconnect lines is altered.
摘要:
A method of manufacturing a semiconductor device using shallow trench isolation is provided, wherein a plurality of protrusions are formed in the exposed surface of the mask layer overlying the active area of the device. The protrusions are preferably formed by forming a photo-resist layer on the surface of the mask layer and patterning the photo-resist layer such that the photo-resist layer defines a plurality of protrusion areas and a depression area within the defined active area. A portion of the mask layer is removed in the defined depression area to form a plurality of protrusions in the mask layer. Thereafter, a dielectric layer is deposited on the exposed surface of the mask layer and in the shallow trench and evenly planarized.
摘要:
A semiconductor manufacturing method comprises forming a leveling guard ring defining an interior area into which are fabricated one or more devices. In certain aspects, two or more matched devices, such as in a common centroid layout, are fabricated in the interior area. The guard ring is formed on at least one particular layer for a particular processing step. By the guard ring overwhelming the effect of local features' elevation differences, photoresist thereafter applied consequently has a more uniform height across the interior area, resulting in more uniform devices. A plurality of guard rings may be used that enclose respective arrays of matched devices arranged over the surface of a semiconductor wafer. Based on the equalizing effect by each of the guard rings, the respective devices arranged in the interior areas are more evenly matched to equivalent devices in far-spaced guard rings. Thus, local and global matching are achieved.
摘要:
A thermally conductive structure for a semiconductor integrated circuit and a method for making the structure. The structure comprises one or more vertical and/or horizontal thermally conductive elements disposed proximate a device for improving thermal conductivity from the device to a substrate of the integrated circuit. In one embodiment a heat sink is affixed to the integrated circuit for heat flow from the integrated circuit. The method comprises forming openings in material layers overlying the semiconductor substrate, wherein the openings are disposed proximate the device and extend to the substrate. A thermally conductive material is formed in the openings to provide a thermal path from the device to the substrate.
摘要:
A semiconductor manufacturing method comprises forming a leveling guard ring defining an interior area into which are fabricated one or more devices. In certain embodiments two or more matched devices, such as in a common centroid layout, are fabricated in the interior area. The guard ring is formed on at least one particular layer for a particular processing step. By the guard ring overwhelming the effect of local features' elevation differences, photoresist thereafter applied consequently has a more uniform height across the interior area, resulting in more uniform devices.In some embodiments, a plurality of guard rings enclosing respective arrays of matched devices are arranged over the surface of a semiconductor wafer, spaced apart so as to be not local to one another. Based on the equalizing effect by each of the guard rings, the respective devices arranged in the interior areas are more evenly matched to equivalent devices in far-spaced guard rings. Thus, both local and global matching are achieved.
摘要:
An integrated circuit having an n-channel MOSFET device and a JFET device. The integrated circuit includes a semiconductor layer having an upper surface, an MOS transistor device formed in a doped well of a first conductivity type extending from the semiconductor upper surface and a JFET device. The JFET device includes a channel region in the semiconductor layer spaced from, and having a peak concentration positioned a predetermined distance below, the upper surface. An associated method of manufacturing includes introducing p-type dopant into the semiconductor surface to form a p-well in which the NMOS device is formed and a source and a drain of the JFET device. N-type dopant is introduced into the semiconductor surface to form an n-type region of the NMOS device below the p-well and a gate region of the JFET device. P-type dopant is introduced into the semiconductor layer to simultaneously form a higher concentration p-type region in the p-well of the NMOS device and a channel region extending between the source and drain of the JFET.
摘要:
A thermally conductive structure for a semiconductor integrated circuit and a method for making the structure. The structure comprises one or more vertical and/or horizontal thermally conductive elements disposed proximate a device for improving thermal conductivity from the device to a substrate of the integrated circuit. In one embodiment a heat sink is affixed to the integrated circuit for heat flow from the integrated circuit. The method comprises forming openings in material layers overlying the semiconductor substrate, wherein the openings are disposed proximate the device and extend to the substrate. A thermally conductive material is formed in the openings to provide a thermal path from the device to the substrate.